# AutomationDirect GS4-2100

Hardware · `GS4-2100` · verification: source checked

The GS4-2100 is a DURApulse GS4 series open-frame AC variable frequency drive rated for 230 VAC input. It delivers 100 hp with a 3-phase input or 25 hp with a 1-phase input, and runs 3-phase induction motors in either sensorless vector control (SVC) or V/Hz mode. Setup and monitoring are done from an attached keypad, and the drive provides an RS-485 port plus discrete and analog I/O for control signals.

## Specification

| Property | Value |
|---|---|
| Category | vfd |
| Weight | 70.76 kg |
| Supply voltage | 230 VAC |
| Frame size | E |
| Output type | PWM output |
| Operating temp min | -10 °C |
| Operating temp max | 50 °C |

## Connected

- Manufacturer: [AutomationDirect](https://machineschema.com/manufacturer/automationdirect.md)
- Protocols: [MODBUS ASCII](https://machineschema.com/protocol/modbus-ascii.md), [MODBUS RTU](https://machineschema.com/protocol/modbus-rtu.md)

## Safety

- Safe Torque Off (STO) is built in.
- An external dynamic braking unit is required.
- A user-supplied external fuse is required.
- Operating temperature range is -10 to +50 deg C.
- Agency approvals: UL Listed file # E198015, CE, and RoHS compliant; no UL Recognized, UL Hazardous or CSA file listed.

## Study notes

- Control modes are SVC or V/Hz; carrier frequency range is 2–15 kHz and output frequency range is 0.1–599 Hz.
- Amperage rating is 242 A with 3-phase input and 75 A with 1-phase input; variable torque amperage rating is 255 A.
- Communication is one RS-485 port on an RJ12 connector running Modbus RTU, Modbus ASCII or BACnet at up to 115.2k baud.
- EtherNet/IP and Modbus TCP are only available through optional cards, not built in.
- I/O: 8 discrete inputs at 24 VDC (sinking/sourcing), 4 discrete outputs including 2 Form C (SPDT) relays, 3 analog inputs (11-bit resolution, 0–20 mA / 4–20 mA or +/-10 VDC) and 2 analog outputs (10-bit, 0–20 mA / 4–20 mA or 0–10 VDC).
- An embedded PLC is programmable in ladder (GSLogic software); connector type is screw terminals.
- Horsepower rating depends on input phases: 100 hp with 3-phase input, 25 hp with 1-phase input.
- Enclosure is open frame for wall mounting, frame size E; the stated IP rating covers both IP00 and IP20.
- Item shipping weight is 156 lb.
- Intended for use with 3-phase induction motors; input signal can be 4–20 mA, voltage or potentiometer.

## Sources

1. [DURApulse AC High-performance Drive: 230 VAC, 100hp with 3-phase input, 25hp with 1-phase input, (VFD) (PN# GS4-2100) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/high-performance_vfds/gs4-2100) (accessed 2026-10-26)
2. [GS4 2100 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/GS4-2100_cutsheet.pdf) (accessed 2026-10-26)

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